There's a bunch of "in mice" research on it, but with actual humans it's really hard because we don't yet have the tools to measure the baseline composition of

There's a bunch of "in mice" research on it, but with actual humans it's really hard because we don't yet have the tools to measure the baseline composition of gut bacteria before and after the experiment. It's all mostly just anecdotal and empirical. Same with the fecal transplant stuff, which (AFAIK) basically replaces one persons gut biome with a different one. Which causes cravings to change completely for the recipient, in some cases resulting in weight loss. Which, to me, kinda tells that it's not a willpower or brain thing, it's just the gut biome controlling what you "want" to eat.